R is 4 if I'm wrong sorry
Answer:
d-2 < -1
Step-by-step explanation:
I assume it would be a combined height of 6 nickles.
Answer : 
Explanation:

shifting 1 to Right hand side becomes -1

shifting 6 on right hand side will divide -1 becomes -1/6

Quadratic equation is the equation having degree 2 and inequality which is not equal to right hand side